In , and . Triangle is congruent to triangle . What is in de...

Question Analysis:
This problem involves triangle congruence and angle relationships.
The main focus is on using the angle sum property of a triangle and congruence properties to determine a specific angle.

Key Concept Explanation:
- Angle Sum Property: The sum of the interior angles of a triangle is always 180°.
- Congruent Triangles: If

, then all corresponding angles are equal.

Step-by-Step Solution:
1. Express Angles in Terms of

:
Given that

and

, we set up the equation:

Substituting the given relationships:

2. Find

and

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